Abstract: A portable length probe having a length measuring wheel with light transmission holes at equally spaced angular intervals thereon, which wheel is rotatably mounted in an integral one piece nose body having a photo-responsive element and a light-emitting element disposed in aligned facing relation in a common bore formed in the nose body transverse to the wheel. The photo-responsive element is an infrared sensitive photo-transistor and the light emitting element is an infrared light emitting diode (LED), and both are encased in cylindrical opaque cases which fit in generally complementary sliding relation within the bore, the cases each having an optically open end facing one another. Increased accuracy is provided by employing frequency doubler circuitry in conjunction with the wheel, in which the wheel light transmission holes are substantially uniform in angular width and are spaced apart a distance substantially equal to such hole angular width.

Abstract: A test fixture adapted to measure the squareness of springs, generally cylindrical objects or the like. Preferably the fixture includes a rigid, planar base adapted to be disposed upon a supporting surface, from which a rigid, calibrated test plate projects generally perpendicularly upwardly. The test plate includes a specially machined testing surface, adapted to contact springs to be tested, which springs can be conveniently supported upon the planar base. The face plate is configured so that springs may be slidingly moved about the base in physical contact with the face to determine their squareness by referring to calibrations provided in the test plate. The surface of the test fixture is described generally by the equation Z.sub.(x,y) =C.sub.1 y (tan C.sub.2 X+C.sub.3)+C.sub.4.

Abstract: The specification discloses a device for detecting movement of two portions of a structure relative one another. The device comprises a first disc defining a radial scale and fixedly securable to the first portion of the structure and a second disc fixedly securable to the second portion of the structure. A telescoping linear scale extends between and is pivotally secured to the center of the radial scale and to the second disc. Consequently, the angular orientation of the telescoping scale with respect to the first disc is displayed on the radial scale; and the distance between the disc members is displayed on the linear scale, providing a measurement of movement between the structural portions. Also disclosed is a method of detecting structure movement comprising securing the device to the two portions of the structure and monitoring subsequent readings displayed on the radial and linear scales.

Abstract: A well mapping apparatus comprises:(a) a magnetic field sensing device whose output is proportional to a local magnetic field vector,(b) an acceleration sensing device whose output is proportional to a local gravity vector,(c) the devices supported for rotation about a common axis, in a borehole,(d) the outputs being usable in the determination of azimuth and inclination of the borehole.

Abstract: There is disclosed a process for dehydrating organic porous material such as brown coal. The process comprises steps of charging the material to a plurality of pressure vessels and filling at least one of the pressure vessels with water, carrying out a dehydration step by supplying steam to the vessel which is filled with water to heat the material therein while exhausting water from that vessel to thereby lower the water surface in the vessel so that the material therein is gradually exposed to the steam and water in the material is removed and mixed with condensed steam to form hot water, transferring the hot water from said first vessel to a substantially top portion of a second vessel while continuously supplying the steam to the first vessel until the second vessel is substantially filled with the hot water, and then expelling the hot water from a substantially bottom portion of the second vessel by the hot water which is transferred from the first vessel to the second vessel.

Abstract: A system and method for venting cooling air from a plurality of filaments with which said air has been associated, employing a Coanda flow attachment means, including a Coanda flow attachment surface, to separate the filaments and air into respective streams, and then to divert said air stream in a direction away from said filament stream.

Abstract: A large scale, industrial system and method for dehydrating fruits, nuts or other produce. The system includes two long air tunnels which are placed end-to-end. Each air tunnel has a conveyor which is used to transport the produce through the air tunnel. As the produce exits one air tunnel, it is dropped from one conveyor onto the other, thus permitting the produce to be turned over before it enters the second air tunnel. Each air tunnel is divided into a number of separate air chambers in which the heated, circulating air is confined so as to reduce heat loss, thus increasing the energy efficiency of the system, and also providing for separate control of the air temperature and humidity levels in each air chamber. Countercirculation of air between adjacent air chambers aids in confining the air through the separate air chambers, as well as the use of resilient flaps which are used to enclose the ends of each air chamber through which the conveyor enters and exits.

Abstract: A Coanda effect nozzle includes first and second longitudinal airfoils mounted in spaced apart relationship generally transverse to the travel of the web. A mechanism is mounted between the first and second airfoils to define orifices adjacent each of the airfoils, so as to create first and second Coanda streams of air along the first and second airfoils, respectively. The first stream of air travels in a direction opposite to the travel of the second stream of air. The first and second streams of air travel generally parallel to the web.

Abstract: A pivotally mounted overhead drying apparatus uses the weight of the blower motor as a counterbalance. The drying apparatus including the blower, ductwork and discharge nozzle comprises an integrated structure which can be slidably positioned lengthwise to vary the position of the pivot axis to achieve a substantially balanced condition. The drying apparatus has a self-positioning means whereby the apparatus pivotally moves to provide clearance in accordance with the profile of the upper surface of a vehicle advancing therebelow. The nozzle is adapted to discharge a high velocity airstream substantially vertically throughout the drying operation.

Abstract: A pair of thin-walled hollow partially liquid-filled cushions are enclosed in cavities formed in the sole of a shoe. The first cushion is positioned to coincide with the plantar pads on the lower sides of the wearer's metatarsals; the second to coincide with the tuberosity of the wearer's calcaneum.

Abstract: A coin blank for the coining of coins, medals and like products, obtained by the forced joining of two metal parts, each of them being of different metal or metal alloy, one forming the internal central part and the other the external perimetrical part, said forced joining of said two component parts being carried out, in a definitive and inseparable way, preferably upon the minting operation.

Abstract: A kind of device on the surface of which numbers, illustrations, or colors are arranged to show the year, month, day, or week is disclosed. Also, puzzles can be provided according to the invention for intellectual play purposes. A plurality of wooden pegs having either a cubic, rectangular, or cylindrical shape are provided wherein on each peg, indicia, such as, numbers, colors, illustrations are placed so as to show the year, month, day, week, or graphical illustrations and/or beautiful designs depending upon the arrangement of the pegs.

Abstract: A calendar device includes first and second distinct cooperative sections. In the first section, calendar years are arranged in several groups and each group of years is designated by a character or marking to distinguish it from the other groups. In the second calendar section, an indicator for each day of each month is accompanied by indications of the names of the seven weekdays, and adjacent to the weekday indications are the characters or markings which identify years in the several groups of the first calendar section.

Abstract: A yearly calendar comprises a board (10) having an array of sections, one for each day of the year, each section having a hole (20) which contains a paper roll (24) printed with a message appropriate or useful for the respective day, such as a fortune, horoscope, riddle, anecdote, quotation, aphorism, etc. The paper rolls are retained by paper overlays (18, 22) on both sides of the board. A user of the calendar punches out each day's paper roll, perferably on the morning of such day. The paper rolls fall down a passageway (16) at the back of the board to a tray (34, 36) under the board, whereupon it is unrolled and read by such user. The punched-out sections of the board provide a useful graphic indication of elapsed days of the year.

Abstract: The device comprises a strip element or band which can be wrapped around a package, the strip element having an integral label for receiving messages. The label may include an integral flap which can be folded over a message - bearing part of the label.

Abstract: A carton serving as a container for a food product, such as a hamburger. The carton in one embodiment is of the so-called clamshell type and includes an upper lid and a lower tray, both the lid and the tray being of generally truncated pyramidal shape. The novel feature of the clamshell carton permits the packager of the food product to indicate on the carton the type of food product therein. One panel of the carton carries a plurality of shutter panels, the shutter panels overlying and normally covering indicia on an indicia panel. With the packaging of a particular food product in the carton, any one of the plurality of the shutter panels is swung out so as to expose corresponding indicia on the indicia panel. By virtue of this construction, a single carton may be employed for the packaging of a variety of generally similarly sized food products.

Abstract: A universally adjustable paper holder comprises first and second vertical extending U-shaped channel members. The vertical extending channel members are coupled to a supporting member in a manner to afford adjustment or separation between the members so that they can be adjusted according to the width of various sizes of paper to be accommodated between channels formed in the vertical U-shaped members. A horizontal cross bar member is adjustably coupled between the vertical members and can be moved in the vertical plane to be utilized as a guide to enable a user to demarcate a particular sentence or line of data which may be implemented on the document being retained by the paper holder.

Abstract: A file search apparatus which is provided with a base having a center pillar, a reel which comprises file accommodating rooms accommodating therein a plurality of files having codes and juxtaposed in a circle and is supported to the center pillar rotatably therearound, a selection device which is supported revolvably to the base to revolve along the outer periphery of the reel so as to read the codes on the files and search for a desired file, a driving device for driving the selection device, and a search display means displaying the searched file, so that the reel rotates to move the searched file to a predetermined position to be taken out therethrough without the trouble of looking for the searched file around the reel.

Abstract: A fire arm mechanism for a multi-barrel weapon has a barrel selector for selecting the firing sequence of the barrels on successive pulls of a trigger (34) common to the barrels. The firing movement (arrow 49) of the trigger is transmitted to the release catches (20, 21) of the different barrels by means of a firing push link (27) pivotally mounted on the trigger and spring-loaded in a direction towards the release catches (arrow 48). In order to shift the firing sequence, the pivot axis (32) of the firing push link (27) is displaced transversely of its longitudinal axis so as to be displaced with respect to the release catches (20, 21), such that the firing push link, depending on its angular position, will either first engage the release catch (21) remote from the pivot center (32) or first engage the release catch (20) close to the pivot center.

Abstract: A telescoping magazine for holding and feeding cartridges to a firearm. The magazine has a fixed portion which itself comprises a firearm-engaging section and a skirt. The firearm-engaging section and the skirt are each provided with a plurality of ribs for holding two parallel offset rows of cartridges. A slide slides within the skirt and comprises slots adapted to receive ribs of the skirt. The magazine also has a follower biased by a spring.

Abstract: A handgun has a frame which includes a hollow pistol grip with an opening through one of its sides to provide access to mechanism contained therein. A grip panel provides a closure for the opening and is releasably secured to the pistol grip by a single fastener which extends centrally through the panel and is threadably engaged with a retaining strip which extends across the opening. One end of the retaining strip is anchored by a pin mounted on the pistol grip. The other end of the retaining strip bears against the inner end of a marginal flange which surrounds the opening in the pistol grip. The pin may comprise a pivot pin which supports a part of the mechanism contained within the pistol grip.

Abstract: There is provided a fishing aid which includes a body, means on the body for attaching one end of a fishing line thereto, and a slot in the body into which the fishing line can be inserted. Within the slot is biased retention means for holding the line in the slot when no tension is on the line, and for releasing the line from the slot when the line tension tending to pull the line out of the slot exceeds a predetermined level. In a preferred form, the biased retention means may include a first and a second member, each movable within respective passageways which are oriented transversely to the slot, with springs or similar members urging the first and second members into positions blocking the slot.

Abstract: A fishing weight or sinker is disclosed which has an axis, essentially coincident with the fishing line on which it is used. The main body of the weight is comprised of a material having a specific gravity substantially greater than one, and includes an axial channel with a first cross sectional configuration extending from a first end thereof, and opening into an enlarged channel portion at a second end with a second cross sectional configuration. A bushing is exteriorly sized and configured for press fitted engagement within the length of the two channel portions and includes an interior screwthreaded fore portion extending from the first end to a tapered portion, somewhat inward of the second end which terminates in a keyhole slot opens radially outward at the second end in alignment with coincident slots opening radially outward through the length of the bushing and main body.

Abstract: A rodent trap is disclosed having a pivotally mounted bait carrier with a catch hole, a cam surface and a magnetic flap biased to an initial trap setting position by a magnet. Thumb pressure is applied to a spring-biased striking bar comprising a major loop and a minor loop wherein the end of a trigger-setting arm is caused to bear down on the cam surface thereby pivotally moving the bait carrier flap substantially from the effect of the magnet and the trigger arm end enters the catch hole and sets the trap.An alternative bait carrier is disclosed which is mounted to the base for wobbly movement so that the lateral as well as vertical movements of the bait arm are effective to spring the trap. The bait carrier and trigger setting arm end cooperatively engage in such a manner as to automatically align the wobbly bait carrier during the trap setting procedure.

Abstract: A toy vehicle including an electronic timing mechanism with an elapsed time display that may be manually started and will be stopped via a switch when the front end of the vehicle is actuated by an impact with a vertical surface so that the time required for the vehicle to travel a predetermined distance to the vertical surface may be measured.

Abstract: The toy vehicle launcher includes lower and upper casing units, the upper unit being slidable in a rectilinear direction relative to the lower unit. Rubber feet on the lower unit frictionally engage the playing surface onto which the toy vehicle is launched. The vehicle is acted upon by a ram having a gear rack in mesh with a relatively large circular gear. Two relatively small circular gears are in mesh with a gear rack on the lower casing unit. All three gears are mounted for rotation in unison on a shaft journaled in bearing plates integral with the upper unit. Manual actuation of the upper casing unit in one axial direction relative to the lower casing unit causes the ram to push the toy vehicle, thereby launching the vehicle.

Abstract: A fruit body of Ganoderma lucidum (Fr.) Karst. having a long stipe is prepared by the method of the invention comprising the following steps;(a) cultivating a seed culture of a Ganoderma lucidum (Fr.) Karst. strain in an artificial solid medium to obtain a fungal tissue bed,(b) maintaining the fungal tissue bed at a humidity of at least 90% and an illumination intensity of at most 500 l.times. to form selectively a primordium of fruit body from the fungal tissue bed, and(c) maintaining the resulting culture at a humidity of from 40 to lower than 90% and an illumination intensity of at least 500 l.times. to form a fungal pileus of the fruit body from the primordium.

Abstract: An automatic gate arrangement has a hollow and tubular lower post part defining an upright post axis and fixed to one side of the path, an upper end wall transverse to the post axis, and lower fasteners releasably securing the upper end wall to the lower post part. A support fixed to the upper end wall extends upward along the post axis therefrom and pivotally supports a gate shaft at the post axis. A reversible drive motor fixed on and underneath the upper end wall in the lower post part has a rotary output extending through the upper end wall. A transmission between the rotary output and the shaft converts rotation of the output into oscillation about the post axis of the shaft. A C-shaped gate projects laterally from the post axis and is secured to the shaft by connecting means for joint rotation about the post axis unless the gate and shaft are relatively rotated about the post axis with a force exceeding a predetermined maximum force.

Abstract: A safety turnstile for permitting entry of the public in one direction and preventing exit of the public in the opposite direction comprises a rotary head which can be removed from the turnstile support post in a rapid and simple manner. The rotary head is tightly fitted on the central pivot which is secured to the top end of the turnstile post. Provision is made for an annular member fixed beneath the base of the head and for a ring provided with projecting lugs which are capable of resilient snap-action engagement within retaining recesses formed in the internal periphery of the annular member. When the lugs are inserted in the annular member, the ring is resiliently coupled with the head which can be released from the post only as a result of an upward thrust followed by a rotational displacement through an angle of 45 degrees.

Abstract: An improved closure operator as for example for a garage door opener wherein a motor is coupled to the drive shaft of the door at one end thereof to drive pull-up and pull-down pulleys and a clutch mechanism is provided between the drive motor and the drive shaft which can be decoupled by moving a lever arm so as to disconnect the motor from the drive shaft to allow the door to be manually opened or closed as, for example, in the event of power failure. The unit results in a substantial simplification over prior art garage door operators which require a rail and trolley mechanism for opening and closing the door.

Abstract: A pipeline 1 crosses a manhole 2 with a degree of clearance and is provided, inside the manhole, with a vertical pipe 19 capped with a removable sealing cover 22. The movement of the pipeline in relation to its surroundings is thus enabled without it being necessary for the manhole to be sealed. The cover is provided with a drainage valve 32 operable from the top of the manhole by a chain 33.

Abstract: A retail footwear assembly including a storage zone containing a stock of shoes and a customer service zone. The customer service zone includes a service counter over which shoes can be passed, a walkway for sales personnel adjacent a first side of the service counter and communicating with the storage zone and a customer fitting area including seating adjacent a second side of the service counter opposite the walkway. In a first preferred embodiment, the storage zone is separated from the customer service zone by a partition, which defines a passage communicating with the walkway. In a second preferred embodiment, the storage zone includes high density shelving adjacent the walkway opposite the service counter.

Abstract: This disclosure relates to a roof edge assembly for use in forming a raised edge or gravel stop on a roof. The nailerless roof edge of the present invention eliminates the need for the piece of wood or nailer which is normally bolted to the top of a cement block wall for the purpose of fastening metal roof edges. The present roof edge assembly comprises a tab strip member which is adapted to be secured adjacent the edge of a roof using adhesive or other attaching means and which has special tab means thereon. The assembly further comprises a cant member having slot means therein adapted to mate with the tab means to secure the cant member to the tab strip member, and a fascia member which is adapted to be mounted on the cant member. The present invention provides for relatively simple, fast, and economical installation of roof edging and is adaptable to conventional roofing sealing membrane and insulation configurations.

Abstract: In principal aspect, a double glazing panel gasket includes a compressible central gasket portion and a fin portion. The central gasket portion provides a moisture-tight seal between a double glazing panel frame and a sash glazing stop, under compression. The fin portion simultaneously applies pressure against the panel, in response to the compression, to provide a moisture-tight seal between the panel and the stop.

Abstract: A retaining clip adapted, inter alia, for mounting a motor vehicle louvre over a vehicle rear window and wherein the retaining clip has a flat part for extending between a window and elastomeric bead whereby the window is mounted. The flat part terminates in a transverse portion and return lip such that the edge of a window is, in the operative position, located between the flat and return lip thereby making removal of the retaining clip extremely difficult.

Abstract: A building construction system that permits the erection of a modular-skeleton structure type building in a very short time utilizing relatively unskilled labor. The construction of vertical metal profile posts which extend from the foundation to the horizontal roof girders in a single unit of uniform cross-section. The roof girders are attached by means of slotted tension bolts. The one-piece vertical profile posts have a cross-section which is essentially the combination of a T-section and an U-section. In the lower part of the building, basement wall elements extend into the vertical profile posts with their angled legs on the inside of the building. In this position, they are secured by a bracing tube.

Abstract: There is disclosed a fixing device for mounting a plate on one side of a flange of a beam, the device comprising a base portion for engagement with an opposite side of the flange, and upstanding portion provided on the base portion, a hole extending through the base and upstanding portions and formed with a screwthread along at least part of its length, and a threaded fastener adapted to be taken through a hole in the plate and into threaded engagement with the hole in the device in order to hold-down the plate onto the flange.

Abstract: A fastener receiver for a vehicle panel construction, panel construction employing same, and method of fastening such panel construction employing such receiver are provided wherein the receiver is an improved two-piece receiver which is adapted to receive a portion of an associated fastener which is fastened to a vehicle frame to thereby fasten the panel construction to such frame in a concealed manner.

Abstract: A prefabricated load-bearing wall panel has a layer of concrete attached to a plurality of spaced apart parallel metal wall studs. The slab support is achieved by flexible bolsters secured at spaced locations to each stud and fastened to a reinforcing mesh embedded in the concrete slab. The bolsters, which are partially embedded in the slab, provide compressive and tensile support for the slab on the studs in a direction generally perpendicular to the general plane of the slab. In addition, the wall panel exhibits a synergistic effect in terms of composite design, wind load strength and shear strength.

Abstract: A frameless enclosure assembly, supported by the structural assembly of a pre-engineered building having first and second support members, comprising a flexible membrane; a membrane attaching assembly attaching a first end of the facing membrane to the first support member, and attaching a second end of the facing membrane to the second support member and extending the facing membrane substantially taut therebetween; an insulation layer of compressible insulation material supported by the facing membrane; a panel member positioned substantially parallel to the insulation layer to dispose same between the panel member and underlaying structural assembly; and a panel securing assembly for securing the panel to the structural assembly and transferring load from the panel member to the structural assembly while the insulation layer substantially uniformly retains its resistance to heat transfer.

Abstract: A control arrangement for terminating the film-heating segment of a sequence of operations for a skin packaging machine. A skin packaging machine having a film supply, a film-bearing frame, an oven for heating the film in the frame, a base having a perforated surface with means for drawing a vacuum at the surface, and means for moving the frame from a position adjacent the oven to a position adjacent the perforated surface of the base further includes a control arrangement for terminating the heating of the film in the frame by the oven substantially responsive to the temperature of the film. The control arrangement includes a temperature sensor positioned adjacent the film in the frame when the frame is adjacent the oven. The temperature sensor cooperates with a temperature comparison circuit in the control arrangement to provide a comparison between the sensor temperature and a reference temperature to produce a comparison signal.

Abstract: A preheated carrier strip of thermoplastic material passes successively through a molding station in which blisters are formed therein, a filling station in which goods to be packaged are introduced into these blisters, a sealing station in which a metallic cover strip is fused onto the carrier strip for hermetically closing the filled blisters, and a cutting station in which the resulting composite tape is divided into individual packages each having one or more rows of blisters. The tape is positively entrained by the two transport rollers, which have peripheral indentations engaged by its blisters, and forms a loop of variable length between these rollers to allow for their instantaneous speed differences. A first photodetector scans the carrier strip between the filling and sealing stations and, on sensing an empty blister, causes the actuation of a perforator punching a hole into a part of the cover strip subsequently coming to overlie the incompletely filled row of blisters.

Abstract: A novel method and apparatus is disclosed for the loading of a carton with a full complement of plastic bags and a cardboard insert. A plunger descends and contacts an insert which, in turn, forces a stack of plastic bags into an empty carton disposed directly below. A pair of intermeshing rollers are also provided to further guide the bags into the carton. Both gusseted and non-gusseted bags can easily be loaded pursuant to the teachings of the present invention.

Abstract: An apparatus for shaping, filling and closing packaging containers is proposed. In order to create an inert gas atmosphere in the head room of packaging containers which are to be closed with a foil strip and in order to distribute portions of a product in the containers, the apparatus has a gas-treatment device having a chamber which narrows toward the closure device. This chamber is defined at the top by the foil strip moving toward it, which is supported by a slide track, and at the bottom by the containers. Protruding into this chamber in the direction in which the containers are conveyed and overlapping the lateral rims of the containers are gas supply lines, which have gas outlet openings directed transversely with respect to their longitudinal axis. The outlet openings are disposed in staggered fashion on sides of the gas supply lines which face one another.

Abstract: A halter for training animals having two loops which automatically expand and contract about the nose and head in response to force released or applied to the reins. The loop about the head is provided with a connection means so that the loop can be installed on the animal's head without pulling it over the sensitive ears. The halter is preferably constructed of a single strand of rope or other flexible material.

Abstract: A mower housing having a plurality of chambers (11 and 12) so proportioned in capacity, and cutting blades (13 and 14) therein, so proportioned in capacity that one chamber and blade can handle and advance the grass clippings blown with air from the other chamber and blade as well as the grass clippings blown with air produced in that one chamber. The housing having means (25) for controlling and directing the flow of grass cuttings discharged from the housing and means (26) for collecting in increments in the form of tufts or bunches and the ejecting of such increments by the mower blade.

Abstract: Disclosed is a hay conditioner of basically typical construction in which the improvement lies in adjustable stop means for use in setting and varying the clearance between the upper and lower conditioning rolls. There is provided at each side of the machine a means including a lever arm disposed below a support for the upper roll and pivoted at one end on the adjacent side of the machine frame, the other end being connected to a screw-threaded adjustment link effective to elevate the lever for engagement with the upper roll support and thus to selectively limit downward movement of the upper roll under action of the usual biasing means. Thus, the upper roll is free to move upwardly in response to crops passing between the rolls, but its downward movement is limited to the stopped position selected by the adjustment link. The link extends upwardly to a free end that is easily accessible to receive a force-applying tool.

Abstract: An anti-wrapping protector for spring fingers on a reel for combines and other harvesting equipment and in particular for use on the type of combine reel generally known as the "Hume" reel. The Hume reel includes mechanisms to keep provided spring teeth or tines on the reel always pointed substantially vertically downward from their support pipe. In combining (harvesting) soy beans and other crops that tend to cling and wrap around anything that moves, as well as cutting hay with windrowers, it has been found that coils in the springs in the well known "Hume" reel as well as the pipes and tine support bats themselves cause wrapping. This requires stopping to clean the material out and great time delays are encountered. The present device is a unitary, molded plastic tubular member that has a slit so the tube can be slipped over the support pipe, bat, and coil of the reel spring tooth and then secured in position to protect the parts from wrapping.

Abstract: The present invention provides a compact mushroom harvester which utilizes a relatively short blade adapted to oscillate horizontally in an arcuate manner and move laterally and longitudinally over the bed, thereby allowing selected mushrooms or small groups of mushrooms to be picked individually. The picked mushrooms are transferred from the bed, preferably by a vacuum article transfer device.

Abstract: An elongated trailer-type vehicle is provided for pulling behind a prime mover such as a lawn tractor. The vehicle includes an elongated frame having vertically adjustable hitch structure at its forward end for releasable hitching behind a lawn tractor and downwardly extendible and upwardly retractable ground engaging support wheels for decreasing and increasing, respectively, the elevation of the frame above the ground surface upon which the wheels rest. The frame additionally includes front and rear depending spring tine assemblies forward and rearward of the wheels and the tine assemblies each include a plurality of depending tines spaced transversely of the frame.